I’ve lived all my life in Northern California, and I’m ashamed to say that I’ve never been hiking at Mount Diablo State Park before this visit! When I saw that the Mount Diablo Interpretive Association (MDIA) had a guided wildflower hike North Peak trail in April 2012, I jumped at the chance. I’m glad I did!
The hike was led by Michael Marchiano, who has lived in the area (including some time spent living at a ranch in what is now the State Park). Michael led our small group on a 3 mile (more or less) round trip, talking about the history of the area and pointing out the unique flowers.
Mount Diablo has large number of trails at several different elevations. I’m sure that we’ll be going back in the future, as there is quite a variety of plants and rock formations on these various trails. MDIA has a calendar that lists the guided hikes that they offer.
Click on any photograph to see a larger image.
The Hike
This particular hike starts just a bit over half a mile down from the Summit Visitor Center. There is a sharp bend in the road with a turnout, called the “Devils Elbow”. The sign for this wasn’t too obvious, but there is a large map kiosk at the turnout (and it is the first big turnout as you come down from the summit).
The trail heads down towards Prospector’s Gap, going along the side of the mountain. You’ll be looking down at mixed chaparral and brush, but there are many flowers right from the beginning. This is a fairly dry and exposed area. As you go around the mountain there is an outcropping off to the side of the trail, a big knob of rock, and I recommend that you take a side trip there (it is just a short distance. This is a great place to sit and enjoy the wonderful view, and there were quite a few flowers here that we didn’t find on other sections of the trail.
As you continue down the trail and around the mountain you start to get into an area with higher shrubs and Bay trees, so there is a bit of shade every once in awhile that is very welcome. If it has been raining recently you may find some small streams.
On this guided hike we went in about 1.5 miles, then we turned back. Now you head back uphill! It wasn’t too bad as long as you take it easy, and there is that wonderful side “knob” for taking a break.
Note that this trail is open to mountain bikes, so pay attention. The trail is well maintained but narrow – we didn’t have problems with the bikes but we did have to stand on the side to let them pass. We also ran into quite a few hikers who were taking the longer hikes out towards North Peak and other areas. There is quite a network of trails. MDIA has a great set of trail maps that you will find useful.
Timing is Everything
This particular hike was taken in April, but this year the rainfall was very irregular so I’m not sure what is normal. We found a great variety of flowers, I’m sure that you can find flowers earlier and later in the Spring. There is such a variety of microclimates in the park that you are sure to find something somewhere in the park from March through May, at the very least. It can get warm, so make sure you take water. It was getting into the mid 80’s on our hike, but it had been much cooler just a few days earlier.
Directions
Mount Diablo State Park has three main entrances: North Gate, South Gate and Mitchell Canyon. You can drive to the summit (which I highly recommend for the wonderful views!) from the North and South gates. Mitchell Canyon is a separate area to the far north of the park, with it’s own trails (and a different collection of flowers than the other areas).
MDIA has a great vicinity map that shows how to get to the park. Concord is to the northwest, Walnut Creek is to the west, and Danville is to the southwest. We entered at the North Gate entrance (which is really more to the west side of the park) from Highway 680.
- Exit at Treat Blvd and follow Treat Blvd east to Oak Grove Road.
- Turn south on Oak Grove Road.
- Continue on Oak Grove Road after crossing Ygnacio Valley Road.
- Look for North Gate Road as it splits off to the left. This will take you to the park entrance.
- Turn left on Summit Road at the Junction Ranger office.
The road up the mountain twists about as you climb up. Keep your eyes open for flowers along the way. At one bend in the road we found a great profusion of Yellow Monkeyflower, and at another we found a nice display of Blue Witch. Before we reached the Summit Road junction there was a wonderful display of California Poppies on the hillside (on Moses Rock Ridge) this year.
Mt Diablo Wildflowers
Michael Marchano helped point many of these out to us. Click on any photograph to see a larger image. I’ll start with a few favorites, and then the “gallery”. All pictures were taken with a Nikkor 18-135mm zoom lens
I was excited to find a small group of Mission Bells (Checker Lily), but the footing was precarious, so the picture didn’t come out as sharp as I would like.
I was surprised to find as many Shooting Stars as we found, these were in the more protected area farther along the trail (near to the Mission Bells).
Devil’s Lettuce is a smaller Fiddleneck. It is also called Bristly Fiddleneck, and you can see why from this closeup.
Coastal Tidytips were found in the rock outcropping (that had a great view). I’m used to seeing Tidytips with a distinct white tip on the petals, which this particular species doesn’t show.
I love taking pictures of California Poppies, look at all that pollen!
If you click on the lightbox image below you will see larger versions of the photos, and you can scroll through all of the plants (and other things) that we found on this hike. All photos are available for purchase in a variety of formats.
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Last Updated on October 23, 2026
The first unidentified flower looks like a Collinsia, maybe Collinsia sparsiflora. The second looks like a Leptosiphon or Linanthus.
Tom, thanks! I think you are right on the Collinsia, although I have to check some of my other pictures of it to see some details. I’ll have to dig in a bit on the other, but I appreciate the direction on that.
I saw some wild flowers around upper and lower parking lots. There were no flower identification signs for visitors. The yellow ones looked liked coreopsis, but one ranger labeled it as buttercup, and another called it monkey flower. Can you identify the yellow flowers growing around the summit?
Without seeing the flower I can’t really tell you. Buttercups are possible, Monkeyflower is possible, and there are many other yellow flowers around. I’ve not been to the top of the mountain in the past few weeks so I don’t know what is there.
If you scroll through the photo gallery at the bottom of this article you will see a number of yellow composite flowers, see if one looks familiar.
On Friday April 9th a friend and I are going to Mt. Diablo State Park to see the wildflowers. Are there any wildflowers that can be seen from the road as we are both in our early 90’s and must be careful. It would be great to know what roads would be the best to drive on.
Thanks very much, Lois
Lois, you said April 9th, but you posted this comment on April 11? I only got this today.
To be honest, I haven’t been to Mt Diablo THIS season, so I don’t have much information. Most of the time the wildflowers are going to only be visible on a hike, and some of those could be a bit energetic for you. You can try the Summit Road, which winds quite a bit, there MIGHT be things to see along the way. But, note that this is such a dry year! You can get to this from either the north or south gate. Note that at the top you can park and there are some great vistas on a nice day, the summit parking area is easy to park at (unless it is crowded, hard to say, but a weekday helps), and very easy to get around up there. Also, from there, the Mary Bowerman trail loops around the top. The entire loop is a mile, and some parts aren’t all that easy, BUT the first 2/10 of a mile is level and paved, ADA accessible, and SOMETIMES there are good flowers there. Again, I don’t know what is going on there now.